Pulsator.



A. H. GIBSON.

PULSATOR.

APPLICATION FILED MAY 15, 1911.

1,085,978, Patented Feb. 3, 1914,

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pipes UNITED stratrns PATENT oriucn.

ARTHUR H. GIBSON, 0F EASTON.' PENNSYLVANIA, ASSIGNOR TO INGERSOLL- RANI COMP A NY, OF NEXV YORK. N. Y., A CQRPORATION OF NEW JERSEY.

PULSATOR.

Specification of Letters Patent.

Application filed May 15, 1511.

Patented Feb. 3, 1914.

Serial No. 627.380.

Be it known that l, Anrntrn H. (irinsox, a subject of the Crown of Great Britain, and resident of Easton. in the county of Xortln ampton and State of Pennsylvania. have invented a new and useful linproven ent in lulsators. of which the 't'ollowing is a specification.

This invention relates to pulsators of that type in which the reciprocation of the pulsator piston will drive a work piston by reciprotatilig columns of air.

The object of this invention is to provide means for changing the balance of the mean pressures before and behind the tool piston for changing the character of the stroke of the tool within certain limits.

A still further object is to provide novel means for insuring the above results, said means including a assage leading from one side to the other siiie or the pulsator piston chamber, said passage having a check valve therein and means for regulating the operation of the check valve.

A practical embodiment of this invention is represented in the accompanying drawings, in connection with an electric motor driven pulsator.

Figure 1' shows the pulsatorinwend gle vation, Fig. 2 shows the same partly in ver tical central section and partly in side ele' vation, and Fig. 3 is an enlarged detail view showing the check valve and the means for regulating the same.

The crank shaft 1 of the pulsator is mounted in suitable hearings in the casing 2, which crank shaft is connected to the pulsator piston 3 by the rod 4:. The pulsator piston is fitted to reciprocate in the piston chamber 5 of the pulsator cylinder 6. The upper and lower ends of the pulsatorpiston chamber 5 are connected in the usual manner to the back and front ends of a work piston chamber not shown herein, through hose 7 and 8 and their passages 9 and 10 in the upper and lower heads 11, 12, of the pulsator cylinder 6.

A pump is provided for raising the pressure in the space below the pulsator piston 3 as the pulsator is operated, which pump is herein shown as comprising the plunger 13 connected to the pulsator piston 3, the chamber 14 in the front head 11 within which chamber the plunger 13 reciprocates, and the usual valve chest 15 surmounting the front head 1] and having therein the Inlet valve 16 and discharge valve 17. A pipe 18' leads from the discharge valve side of the chest 15 to the pulsator piston chamber 5 at such a point that the air is discharged into the pulsator piston chamber Sbeneath the the piston approaches the limit piston 3 of its upward movement. I

A passage 19 connects the opposite ends of the pulsator piston chamber 5 in which passage is located a check valve 20, which check valve is so arranged as to be opened by an excess of pressure from the under side of the pulsator piston chamber 5.

A manually operated device for regulating the amount of air which can pass the check valve 20 is provided. In the present instance. this is shown a coiled spring 21 interposed between a screw cap 22 and the valve 20 which is herein shown as a ball valve. An adjusting screw 23 extends through the cap 22 and its inner end 24 may be adjusted toward and away from the valve 20 to limit the amount of opening of the said valve. This screw may be provided with a suitable operating handle 25. It is obvious that the amount of air whichis permitted to pass the valve 20 may be regulated either by adjusting the tension of the sprin 2101' by adjusting the screw 23 or by both means combined.

In operation, it the check valve 20 be held immovably in its seat, the maximum mean pressure will be on the lower side of the pulsatorpistonS and the minimum mean pressure will be on the upper side thereof, which will, in the form herein shown, cause the tool to strike its work with the minimum effeet. If it be desired to raise the mean pressure on the upper side of the pulsator piston and lower the mean pressure on the lower side of said piston for causing the tool to strike a blow of greater force, the regulator for'the check valve may be adjusted for this purpose.

In the present instance, I have shown the pulsator as driven from an electric motor 26,both the pulsator and motor beingmounted on a portable truck 27.

While I have described the operation of this pulsator in connection with'a tool piston, it is obvious that the pulsator may be used for any desired purpose without departing from the spirit and scope of. my invention.

What I elaim is 1. A gulsator having a passage independent of the main inlet and discharge passage connecting the opposite ends of the piston chamber, a check valve in said passage and means for regulating the opening of the check valve.

2. A pulsator having a passage independ ent of the main inlet and discharge passage connecting the opposite ends of the plStOH chamber, a check valve in said passage andinanually operated means for regw lating the opening of the check valve.

3. A pulsatoinzwing a passage independ ent of the main inlet and discharge passage eonneeting the opposite ends of its piston chamber. a check valve in saitl passa e,-

means for regulating the opening of tie check valve and means for raising the air pressure in one end of the piston chamber.

4. A ulsatoi' having a passage indepndent of t 1e main inlet and discharge passage connecting the opposite ends of its piston ehamber, a check valve in said passage,-

manually operated means for regulating the 6 opening of the check valve and means for eaaava raising the air pressure in one end of said pistonchamber. 1 t

5. A. pnlsat'or including a pump for rais ing the air pressure in one end of the piston chamber, passage independent of the inain'i'nlet and discharge passage connecting the opposite ends of the piston chambena check valve in said passage, and means for regulating the opening of the check valve.

6. A. pu'lsator including a pump 01 raisingthe ainpressure in one end of the piston chamber, a assage independent of the main inlet and discharge passage connecting the opposite ends of the'piston chamber, a checlivalve in said pflSSag-Q and manually operated meansfor regulating the opening of the check valve.

In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two witnesses, this fifth day of May 191.1. v

. ARTHUR H. GIBSON. \Vit'nesses F. Gnome BARRY, (l. S. SUNDGRE'N. 

